Mobil 1 Recommends 0w-40. I have been using it in my car, but the dealership recommends 5w-40...

02 A6 Quattro 3.0L

Should I even switch to a heavier OIL i sit in Traffic allot and i commute quite a bit.

If i should switch what oil would be better for my engine (I hear my lifters Sometimes)

5w-40 Choices...

http://www.mobiloil.com/USA-English/...a_M_5W-40.aspx

http://www.mobiloil.com/usa-english/...uck_5w-40.aspx

 

There is no difference between 0W40 and 5W40 @ operating temperature. The 0W is slightly thinner @ lower temps which may be advantageous for cold starts in sub-zero climates.

IMO, stick w/ the Mobil 0W40...thier 5W40 isn't VW/Audi approved(...at least in N. America it isn't).

UberTeile

 

I use Rotella T6 5w-40 and it is excellent! $19.50/gal at walmart.

 

Concur. A non-turbo engine should be fine with synthetic 5W-40, even in colder weather.